Blade & Vibration Monitor Model Hood Technology Corporation 30 August 2009 Blade & Vibration Monitor Model Overview

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1 Hood Technology Corporation 30 August 2009 Blade & Vibration Monitor Model 5000 Overview This system accommodates the signals from many different types of non -contacting blade tip sensors including: light probes, eddy current sensors, AC or DC capacitive sensors, inductive sensors and microwave sensors. Selecting the appropriate sensor to usedepends on the application. General requirements for a preamplified sensor signal are: Amplified sensor signal >80mV for each blade passage. One steep rising or falling edge for each blade passage. Signal to Noise ratio >40dB. Hood Technology Sensors and Preamplifiers designed specifically for this system Console Housing The system is housed in a durable shipping crate on casters. This allows for easy positioning for use, simple packing for moving locations and onsite operation. Size: 36 deep x 26 wide x 40 top to ground including casters Weight: Varies with contents 75 kg typical

2 Basic Equipment National Instruments PXI chassis Computer Controller, Monitor, Keyboard and Mouse Internal rack can hold up to 10 BVSI units to support 30 channels. BVSI converts sensor signals to time of arrival blade pulse and amplitude. All sensor signals available on BNC outputs for archiving raw sensor signal data Acquisition software allows user to easily configure sensor triggering parameters and view in real time synchronous and non-synchronous vibration responses. Sensors and Preamplifiers Hood Technology Corporation can supply sensors and preamplifiers. This includes sensors and preamplifiers for: Light Probes Single fiber probes, 7 fiber probes, line sensors, Skewed Dual Light Probes (for measuring tip clearance), uncooled high temperature probesand air-cooled high temperature probes. Each preamplifier has three channels of lasers and photodetectors and mates with a three-channel module of BVSI board and PCI-6602 counter/timer card.

3 Eddy Current Sensors Sensors of various types and sizes with 5mm to 25mm diameters. These are capable of observing blade passage through thin metallic or non-metallic walls. An air-cooled high temperature version with embedded thermocouple is available as well for extreme heat environments. These sensors can be calibrated to measure tip clearance. Each preamplifier accommodates 3 sensors and mates with a three -channel module of BVSI board and PCI counter/timer card. Hood Technology Blade Vibration Sensor Interface (BVSI) Model 5.3 The BVSI board accepts analog signals and converts each analog signal into a TTL pulse train, which is accepted by the PXI-6602 counter/timer card. Additionally, each blade pulse s maximum amplitude is encoded in a secondary pulse for each blade passage. This is usedfor measuring tip clearance. Each BVSI board drives one PCI counter/timer card. Specifications: National Instruments PXI A/D TTL pulses generated by the BVSI board are timed with a National Instruments PXI Counter/Timer board. The board uses a 32 bit counter and operates at 20MHz or 80MHz. Additionally, PXI A/D cards are used to view analog signals to allow foradjustingconditioning parameters.

4 The total acquisition rate is limited by 1.5Mpulses/second. This rate must be considered when specifying a system. To calculate maximum required sample rate, multiply the maximum rotor speed (in Hz) by the blade count and number of sensors used. Multiply again by 2 if blade pulse amplitude is of interest. If the limit of 1.5Mpulses/second limit may be exceeded, the measurement will require two or more data systems. Personal Computer and Software A PXI chassis with computer controller, with a 3.0GHz Pentium III and Windows XP or better is used. Two software routines allow the user to acquire data and then view and analyze it. Hood Technology Acquire Blade Data Software Standard software designed for operating data acquisition and viewing real time results. Hood Technology Analyze Blade Vibration Software Allows more detailed off line analysis with more report generating utilities. Customized Software In many applications customized software is required. Most notably, real-time low cycle fatigue applications have been developed for customers. Cabling All necessary cables are included with the system.

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